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1 Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.5  This is what we refer to as the fish's tail. 6  Anal fins are on the ventral (bottom) surface of the fish, behind the anus. Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.
Characteristics and Classification of Bony Fish: Some documents refer to the bony fish as the Osteichthyes, which used to be recognized as a class of organisms. Osteichthyes is still used commonly to refer to the two main types of bony fish: 1  Ray-finned fishes, or Actinopterygii.2  Lobe-finned fishes, or Sarcopterygii, which includes the coelacanths and lungfishes.haracteristics and Classification of Bony Fish: Some documents refer to the bony fish as the Osteichthyes, which used to be recognized as a class of organisms. Osteichthyes is still used commonly to refer to the two main types of bony fish: 1  Ray-finned fishes, or Actinopterygii.